This new silver barrel nut shim kit includes spacers for adjusting free float handguards. The set is designed to help achieve proper alignment and a secure fit during firearm assembly or customization. It is a practical component for gunsmiths or individuals building or modifying an AR-platform rifle. The kit is offered in a silver finish. Please note this listing is for the shim kit only. Free shipping is available for this new item. As specific dimensions and material composition are not provided, check the listing for full details to ensure compatibility with your specific barrel nut and handguard system. Barrel Nut Shim Kit, Nuts Free Float Spacers Adjustment Silver. Condition: New. Listed at 12.65 USD. Fit between the barrel extension and the barrel nut. Compatible with standard barrel nut, fit. 223, 5.56, 6.8 and 300 BLK. Will NOT work with. 308 Win and 6.5 Creedmoor barrels or barrel nut. Thread Size: 1.0".